An antenna apparatus includes: (a) A radial waveguide parallel with a reference plane and having a first conductive element in parallel spaced relation with a second conductive element. The radial waveguide has a first signal coupling locus for coupling signals with a host unit and a plurality of second signal coupling loci. The radial waveguide distributes signals between the first signal coupling locus and the second signal coupling loci. (b) signal coupling elements, each presenting a respective signal coupling path for effecting signal coupling association with a respective second signal coupling locus. Each signal coupling path is perpendicular with the reference plane. (c) antenna elements, each associated with a signal coupling element, each a polygonal element parallel with the reference plane. The radial waveguide element, the signal coupling elements and the antenna elements cooperate to transfer electromagnetic signals between the host unit and a medium adjacent to the antenna elements.
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6. An antenna apparatus comprising:
(a) a radial waveguide element oriented generally parallel with a reference plane; said radial waveguide element having a first signal coupling locus for coupling signals with a host unit, and having a plurality of second signal coupling loci; said radial waveguide element effecting distribution of electromagnetic signals between said first signal coupling locus and said plurality of second signal coupling loci; (b) a plurality of signal coupling slot-line elements; each respective signal coupling slot-line element of said plurality of signal coupling slot-line elements presenting a substantially linear electromagnetic signal coupling path for effecting an electromagnetic signal coupling association with a respective said second signal coupling locus; each respective said signal coupling path being substantially coincident with a respective signal coupling axis substantially perpendicular with said reference plane; and (c) a plurality of antenna elements; each respective antenna element of said plurality of antenna elements being situated for electromagnetic coupling with a respective said signal coupling slot-line element; each said respective antenna element being substantially parallel with said reference plane and substantially symmetrical with a respective said signal coupling axis; said radial waveguide element; said plurality of signal coupling slot-line elements and said plurality of antenna elements cooperating to transfer electromagnetic signals between said host unit and a medium adjacent to said plurality of antenna elements.
1. An antenna apparatus comprising:
(a) a radial waveguide element; said radial waveguide element being oriented generally parallel with a reference plane; said radial waveguide element having a first substantially planar conductive element substantially parallel with said reference plane and in parallel spaced relation with a second substantially planar conductive element; said radial waveguide element having at least one first signal coupling locus at said first conductive element for coupling signals with a host unit and a plurality of second signal coupling loci distributed in said second conductive element; said radial waveguide element effecting distribution of electromagnetic signals between said first signal coupling locus and said plurality of second signal coupling loci; (b) a plurality of signal coupling elements; each respective said signal coupling element of said plurality of signal coupling elements presenting a respective signal coupling path for effecting an electromagnetic signal coupling association with a respective said second signal coupling locus; each said respective signal coupling path being substantially perpendicular with said reference plane; and (c) a plurality of antenna elements; each respective said antenna element of said plurality of antenna elements being associated with a respective said signal coupling element; each said respective antenna element being a polygonal shaped element substantially parallel with said reference plane; said radial waveguide element, said plurality of signal coupling elements and said plurality of antenna elements cooperating to transfer electromagnetic signals between said host unit and a medium adjacent to said plurality of antenna elements; said plurality of signal coupling elements including a plurality of slot-line coupling elements.
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The following applications contain subject matter similar to the subject matter of this application.
U.S. Pat. Ser. No. 10/199,266, filed Jul. 19, 2002 U.S. Pat. No. 6,642,890, entitled "APPARATUS FOR COUPLING ELECTROMAGNETIC SIGNALS";
U.S. Pat. Ser. No. 10/199,724, filed Jul. 19, 2002, entitled "A TUNABLE ELECTROMAGNETIC TRANSMISSION STRUCTURE FOR EFFECTING COUPLING OF ELECTROMAGNETIC SIGNALS"; and
U.S. Pat. Ser. No. 10/199,732, filed Jul. 19, 2002 U.S. Pat. No. 6,642,810, entitled "WAVEGUIDE APPARATUS".
The present invention is directed to electromagnetic antennas, and especially to electromagnetic antenna arrays employing a plurality of antenna elements known as patch antenna elements. Such patch antenna construction is advantageous in constructing antenna arrays that are known as steerable beam antennas. Steerable beam antennas employ fixed antenna elements, such as patch antenna elements, to "steer" loci of sensitivity (i.e., transmitting beams or bearings of reception) by establishing predetermined interference patterns among the various patch antenna elements. The desired predetermined interference patterns are commonly effected by imposing phase differences among the various patch antenna elements.
In today's marketplace it is desirable that a small compact steerable beam and antenna device be available for communication, locating (e.g., radar) and other applications.
It is desirable that patch antenna elements in steerable beam antennas be closely or densely situated in order that maximum interaction among the various patch antenna elements may be realized to "steer" loci of sensitivity (i.e., transmitting beams or bearings of reception) by establishing predetermined interference patterns among the various patch antenna elements. Prior art coupling structures employed for coupling the respective patch antenna elements with a signal coupling locus (e.g., a transmission line leading to a host device such as a transceiver for radio or radar operations) have heretofore occupied an undesirable lateral expanse about the respective antenna patch elements. As a result, antenna patch elements have not been as densely situated as desired. One solution has been to provide larger antenna patch elements. Installing an antenna patch element that occupies a larger area provides a larger available expanse in the vicinity of that patch element for effecting the requisite electromagnetic coupling and phase shifting of electromagnetic signals. However, the larger the respective patch elements, the less resolution that can be established in steering beam operations. That is, larger patch elements yield coarser beam patterns that result in coarser control of beam steering operations.
Another desired feature for steerable beam antenna device is that electromagnetic signals transferred between the various antenna patch elements and a signal coupling locus (e.g., coupling with a host device) be of equal strength. That is, it is desired that the structure or device that effects the desired distribution does not itself impart a variance to the signals being distributed.
There is a need for a steerable beam antenna device that is small, compact and densely populated with respective antenna patch elements.
An antenna apparatus includes: (a) A radial waveguide parallel with a reference plane and having a first conductive element in parallel spaced relation with a second conductive element. The radial waveguide has a first signal coupling locus for coupling signals with a host unit and a plurality of second signal coupling loci. The radial waveguide distributes signals between the first signal coupling locus and the second signal coupling loci. (b) Signal coupling elements, each presenting a respective signal coupling path for effecting signal coupling association with a respective second signal coupling locus. Each signal coupling path is perpendicular with the reference plane. (c) Antenna elements, each associated with a signal coupling element, each a polygonal element parallel with the reference plane. The radial waveguide element, the signal coupling elements and the antenna elements cooperate to transfer electromagnetic signals between the host unit and a medium adjacent to the antenna elements.
It is, therefore, an object of the present invention to provide a steerable beam antenna device that is small, compact and densely populated with respective antenna patch elements.
Further objects and features of the present invention will be apparent from the following specification and claims when considered in connection with the accompanying drawings, in which like elements are labeled using like reference numerals in the various figures, illustrating the preferred embodiments of the invention.
An aperture 30 traverses first conductive element 22. Antenna element 10 is designed for efficient performance at an operating frequency f0. Dimensions of aperture 30 are determined for efficient operation as a function of operating frequency f0. Aperture 30 is preferably substantially rectangular oriented about a major axis 32.
Slot line coupling structure 12 includes a first dielectric slot line substrate 40 with a first transmission conductive layer 42 on a side of first slot line substrate 40 that is distal from antenna element 10, and a second transmission conductive layer 44 on a side of first slot line substrate 40 that is proximal to antenna element 10. Second transmission conductive layer 44 has a slot 50 traversing second transmission conductive layer 44. Slot 50 extends from a first edge 46 toward a second edge 48 opposing first edge 46 to a slot termination locus 51. Slot 50 is oriented about an axis 52. Axes 32, 52 are substantially perpendicular.
Thus, electromagnetic signals are transmitted, for example, from a signal coupling locus (not shown in
One skilled in the art of antenna design will recognize that receive operations by antenna element 10 will be carried out in substantially the same manner to couple signals received by antenna element 10, via aperture 30 to slot 50 and thence via slot 50 to a host device (not shown in FIG. 1). Transmitting operations of antenna elements, including the antenna apparatus of the present invention, are used frequently throughout this specification as illustrative of the operation of antenna apparatuses in either transmission or reception operations.
A significant shortcoming of the prior art coupling arrangement illustrated in
Coaxial cable 108 is coupled with a transition element 112. Transition element 112 facilitates substantially even distribution of energy coupled from coaxial cable 108 to radial waveguide 102. Radial waveguide 102 includes a first conductive member 120 and a second conductive member 122. Conductive members 120, 122 are preferably metal, preferably substantially circular and centered on a common axis 116, preferably planar and preferably parallel.
Second conductive member 122 is provided with a plurality of signal coupling loci embodied in a plurality of signal coupling apertures, or slots 130, 132, 134, 136. Signal coupling slots 130, 132, 134, 136 traverse second conductive member 122.
A plurality of signal coupling elements 140, 142, 144, 146 are provided. Each respective signal coupling element 140, 142, 144, 146 is substantially in register with a respective signal coupling slot 130, 132, 134, 136. Each respective signal coupling element 140, 142, 144, 146 is embodied in a slot line signal transmission structure having one side of a substrate clad or covered in a conductive, preferably metal, layer, and an opposing side of the substrate bearing two conductive, preferably metal, lands with a narrow substantially linear slot separating the two lands. Antenna apparatus 100 is designed for efficient performance at an operating frequency f0. The width of the slot that separates the two conductive lands on one side of each respective signal coupling element 140, 142, 144, 146 is a function of operating frequency f0.
Thus, signal coupling element 140 has two metal lands 150, 152 separated by a slot 154. A substrate 156 is visible in
A plurality of antenna elements 190, 192, 194, 196 are couplingly provided electromagnetic signals by signal coupling elements 140, 142, 144, 146. Each respective antenna element 190, 192, 194, 196 is substantially in register with a respective signal coupling element 140, 142, 144, 146. Each respective antenna element 190, 192, 194, 196 is embodied in a substrate clad or covered in a conductive, preferably metal, layer on each of two opposing faces, or sides. Thus, antenna element 190 is embodied in a substrate 200 with conductive, preferably metal, layers 202, 204 on opposing faces of substrate 200. Preferably metal layer 202 occupies a smaller area than is occupied by metal layer 204. Antenna element 192 is embodied in a substrate 210 with conductive, preferably metal, layers 212, 214 on opposing faces of substrate 210. Preferably metal layer 212 occupies a smaller area than is occupied by metal layer 214. Antenna element 194 is embodied in a substrate 220 with conductive, preferably metal, layers 222, 224 on opposing faces of substrate 220. Preferably metal layer 222 occupies a smaller area than is occupied by metal layer 224. Antenna element 196 is embodied in a substrate 230 with conductive, preferably metal, layers 232, 234 on opposing faces of substrate 230. Preferably metal layer 232 occupies a smaller area than is occupied by metal layer 234.
Coupling apertures are provided in each respective antenna element metal layer adjacent with a respective coupling element for effecting coupling between a respective signal coupling element--antenna element pair. Thus, metal layer 204 of antenna element 190 is provided with an aperture 203 substantially in register with slot 154 of signal coupling element 140. Metal layer 214 of antenna element 192 is provided with an aperture 213 substantially in register with slot 164 of signal coupling element 142. Metal layer 224 of antenna element 194 is provided with an aperture 223 substantially in register with slot 174 of signal coupling element 144. Metal layer 234 of antenna element 196 is provided with an aperture 233 substantially in register with slot 184 of signal coupling element 146.
Energy is couplingly provided from coaxial cable 108 at signal transfer locus 106. Transition element 112 assists in substantially evenly distributing electromagnetic energy in the form of electromagnetic waves 126. Energy embodied in electromagnetic waves 126 is couplingly transferred with signal coupling elements 140, 142, 144, 146 via signal coupling slots 130, 132, 134, 136. Signal coupling elements 140, 142, 144, 146 couplingly transfer electromagnetic energy via slots 154, 164, 174, 184 and apertures 203, 213, 223, 233 with antenna elements 190, 192, 194, 196. Orientation of each respective signal coupling slot 130, 132, 134, 136 determines the portion of the respective electromagnetic wave 126 traversing a respective signal coupling slot 130, 132, 134, 136. It is by selectively orienting respective signal coupling slots 130, 132, 134, 136 that one may assure that respective electromagnetic signals 126 arriving at respective signal coupling elements 140, 142, 144, 146 are substantially of equal signal strength. This aspect of the antenna apparatus of the present invention is discussed in greater detail in connection with FIG. 7.
Slot 254 is filled with a dielectric phase shifting material 258. Phase shifting material 258 may somewhat overfill slot 254, so long as an electrical potential may be applied across phase shifting material 258, as by applying a voltage across metal lands 250, 252 from terminals 260, 262 via electrical leads 264, 266. Phase shifting material 258 can be tuned at room temperature to alter the phase of electromagnetic signals traversing phase shifting material 258 in slot 254 by controlling an electric field across phase shifting material 258. Such tuning may be effected, for example, by altering electrical potential across metal lands 250, 252 via terminals 260, 262 and electrical leads 264, 266. Phase shifting material 258 is preferably substantially the same material as is described in U.S. patent application Ser. No. 09/838,483, filed Apr. 19, 2001, by Louise C. Sengupta and Andrey Kozyrev, for "WAVEGUIDE-FINLINE TUNABLE PHASE SHIFTER", assigned to the assignee of the present invention. That is, the preferred embodiment of phase shifting material 258 is comprised of Barium-Strontium Titanate, BaxSr1-xTiO3 (BSTO), where x can range from zero to one, or BSTO-composite ceramics. Examples of such BSTO composites include, but are not limited to: BSTO--MgO, BSTO--MgAl2O4, BSTO--CaTiO3, BSTO--MgTiO3, BSTO--MgSrZrTiO6 and combinations thereof. Other materials suitable for employment as phase shifting material 258 may be used partially or entirely in place of barium strontium titanate. An example is BaxCa1-xTiO3, where x ranges from 0.2 to 0.8, and preferably from 0.4 to 0.6. Additional alternate materials suitable for use as phase shifting material 258 include ferroelectrics such as PbxZr1-xTiO3 (PZT) where x ranges from 0.05 to 0.4, lead lanthanum zirconium titanate (PLZT), lead titanate (PbTiO3), barium calcium zirconium titanate (BaCaZrTiO3), sodium nitrate (NaNO3), KNbO3, LiNbO3, LiTaO3, PbNb2O6, PbTa2O6, KSr(NbO3) and NaBa2(NbO3)5 and KH2PO4. In addition, phase shifting material 258 may include electronically tunable materials having at least one metal silicate phase. The metal silicates may include metals from Group 2A of the Periodic Table, i.e., Be, Mg, Ca, Sr, Ba, and Ra, preferably Mg, Ca, Sr and Ba. Preferred metal silicates include Mg2SiO4, CaSiO3, BaSiO3 and SrSiO3. In addition to Group 2A metals, metal silicates in phase shifting material 258 may include metals from Group 1A, i.e., Li, Na, K, Rb, Cs and Fr, preferably Li, Na and K. For example, such metal silicates may include sodium silicates such as Na2SiO3 and NaSiO3-5H2O, and lithium-containing silicates such as LiAlSiO4, Li2SiO3 and Li4SiO4. Metals from Groups 3A, 4A and some transition metals of the Periodic Table may also be suitable constituents of the metal silicate phase of phase shifting material 258. Additional metal silicates may include Al2Si2O7, ZrSiO4, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8, CaMgSi2O6, BaTiSi3O9 and Zn2SiO4.
Signal coupling element 340 has two metal lands 350, 352 on one side or face of a substrate 356 separated by a slot 354. Another conductive land 351 is on the opposing face of substrate 356. Signal coupling element 342 has two metal lands 360, 362 on one side or face of a substrate 366 separated by a slot 364. Another conductive land 361 is on the opposing face of substrate 366. Signal coupling elements 340, 342 are oriented on conductive member 322 with their respective substrates 356, 366 parallel with a radius 301 from center 300 of conductive member 322. A second radius 302 is substantially perpendicular with radius 301 so that substrate 356 is substantially perpendicular with radius 302. A coupling element angle φ defines the angle established between the planar face of a respective signal coupling element and a radius substantially bisecting a coupling slot in the respective signal coupling element. Thus, angle φ1 is established for signal coupling element 340 with respect to radius 302 at substantially 90 degrees. Angle φ2 is established for signal coupling element 342 with respect to radius 301 at substantially 0 degrees. The antenna apparatus of the present invention typically employs a greater number of signal coupling elements (and associated antenna elements) in a more closely packed, denser distribution on conductive member 322 than are shown in FIG. 7. Only signal coupling elements 340, 342 are shown in
Signal coupling slot 330 is substantially rectangular having a major axis 333 and a minor axis 331 substantially perpendicular with major axis 333. Energy is transferred across signal coupling slot 330 substantially parallel with minor axis 331 for effecting electromagnetic signal coupling with signal coupling element 340. Major axis 333 establishes a coupling slot angle θ1 with radius 302. Energy transferred across signal coupling slot 330 parallel with minor axis 331 is a vector component of signals propagated from center 300 (described in connection with FIG. 2). If minor axis 331 is perpendicular with radius 302, then no component of energy will be available for transfer across signal coupling slot 330 parallel with minor axis 331. Signal coupling slot 332 is substantially rectangular having a major axis 335 and a minor axis 337 substantially perpendicular with major axis 335. Energy is transferred across signal coupling slot 332 substantially parallel with minor axis 337 for effecting electromagnetic signal coupling with signal coupling element 342. Major axis 335 establishes a coupling slot angle θ2 with radius 301. Energy transferred across signal coupling slot 332 parallel with minor axis 337 is a vector component of signals propagated from center 300 (as described in connection with FIG. 2). If minor axis 337 is perpendicular with radius 301, then no component of energy will be available for transfer across signal coupling slot 332 parallel with minor axis 337.
The inventor has discovered that it is preferable for coupling element angle φ and coupling slot angle θ to be related according to the following expression in order to assure effective coupling across respective coupling slots to respective coupling elements:
Given such a relation between coupling element angle φ and coupling slot angle θ it may be observed that the respective angles may range among the following values:
By arranging the dimensions of signal coupling slots, such as signal coupling slots 330, 332, to accommodate a desired operating frequency f0 and by adjusting the attitude (manifested in respective coupling slot angles θ and coupling element angles φ) of respective signal coupling slots, such as signal coupling slots 330, 332, one can control the amount of energy couplingly transferred between a respective signal coupling slot and its associated signal coupling element for further transfer with a respective antenna element (not shown in
The antenna apparatus of the present invention permits denser juxtaposition of smaller individual antenna patch elements than is permitted using prior art coupling technology (FIG. 1). Moreover, the antenna apparatus of the present invention is particularly well suited for steerable beam antenna arrays because it provides a compact phase adjusting structure and a design facility for equalizing signal strengths of various signals couplingly provided to respective antenna patch elements.
It is to be understood that, while the detailed drawings and specific examples given describe preferred embodiments of the invention, they are for the purpose of illustration only, that the apparatus of the invention is not limited to the precise details and conditions disclosed and that various changes may be made therein without departing from the spirit of the invention which is defined by the following claims:
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